Theatrum Arbitri is a literary study dealing with the possible influence of Roman comic drama (comedies of Plautus and Terence, theatre of the Greek and Roman mimes, and fabula Atellana) on the surviving fragments of Petronius' Satyrica. The theatrical assessment of this novel is carried out at the levels of plot-construction, characterization, language, and reading of the text as if it were the narrative equivalent of a farcical staged piece with the theatrical structure of a play produced before an audience. The analysis follows the order of each of the scenes in the novel. The reader will also find a brief general commentary on the less discussed scenes of the Satyrica, and a comprehensive account of the theatre of the mimes and its main features.